Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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io_context::poll_one

Run the io_context object's event processing loop to execute one ready handler.

count_type poll_one();
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(Deprecated: Use non-error_code overload.) Run the io_context object's event processing loop to execute one ready handler.

count_type poll_one(
    boost::system::error_code & ec);
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